linux-kernel - Re: [PATCH v2 1/2] dt-bindings: interrupt-controller: sifive,plic: Document Renesas RZ/Five SoC

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Date:   Mon, 27 Jun 2022 13:27:45 +0100
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Marc Zyngier <maz@...nel.org>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Sagar Kadam <sagar.kadam@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Biju Das <biju.das.jz@...renesas.com>
Subject: Re: [PATCH v2 1/2] dt-bindings: interrupt-controller: sifive,plic:
 Document Renesas RZ/Five SoC

Hi Marc,

Thank you for the review.

On Sun, Jun 26, 2022 at 1:35 PM Marc Zyngier <maz@...nel.org> wrote:
>
> On Sun, 26 Jun 2022 01:43:25 +0100,
> Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com> wrote:
> >
> > Document Renesas RZ/Five (R9A07G043) SoC.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > ---
> > v1->v2:
> > * Fixed binding doc
> > * Fixed review comments pointed by Krzysztof.
> >
> > RFC->v1:
> > * Fixed Review comments pointed by Geert and Rob
> > ---
> >  .../sifive,plic-1.0.0.yaml                    | 44 +++++++++++++++++--
> >  1 file changed, 41 insertions(+), 3 deletions(-)
> >
> > diff --git a/Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.yaml b/Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.yaml
> > index 27092c6a86c4..59df367d1e44 100644
> > --- a/Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.yaml
> > +++ b/Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.yaml
> > @@ -28,7 +28,10 @@ description:
> >
> >    While the PLIC supports both edge-triggered and level-triggered interrupts,
> >    interrupt handlers are oblivious to this distinction and therefore it is not
> > -  specified in the PLIC device-tree binding.
> > +  specified in the PLIC device-tree binding for SiFive PLIC (and similar PLIC's),
> > +  but for the Renesas RZ/Five Soc (AX45MP AndesCore) which has NCEPLIC100 we need
> > +  to specify the interrupt type as the flow for EDGE interrupts is different
> > +  compared to LEVEL interrupts.
> >
> >    While the RISC-V ISA doesn't specify a memory layout for the PLIC, the
> >    "sifive,plic-1.0.0" device is a concrete implementation of the PLIC that
> > @@ -57,6 +60,7 @@ properties:
> >            - enum:
> >                - allwinner,sun20i-d1-plic
> >            - const: thead,c900-plic
> > +      - const: renesas,r9a07g043-plic
>
> Since it is the NCEPLIC100 that is broken, shouldn't the compatible
> string actually reflect that? I'd rather see 'andes,nceplic100' once
> and for all instead of starting with Renesas, quickly followed by all
> the other licensees that will inevitably integrate the same IP (which
> isn't even specific to the AX45MP).
>
> This IP also comes with all sort of added (mis-)features, which may or
> may not be used in the future, and it would make sense to identify it
> specifically.
>
Agreed, I'll update it as above.

Cheers,
Prabhakar